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From "jigsaw (JIRA)" <>
Subject [jira] [Created] (NET-546) NPE because of returning wrong reply-code for openDataConnection while performing MPUT
Date Mon, 07 Jul 2014 11:25:33 GMT
jigsaw created NET-546:

             Summary: NPE because of returning wrong reply-code for openDataConnection while
performing MPUT
                 Key: NET-546
             Project: Commons Net
          Issue Type: Bug
          Components: FTP
    Affects Versions: 3.3
         Environment: Win7, System i (IBM)
            Reporter: jigsaw

Hi there,

I'm trying to transfer some data from a Windows 7 system to a System i (IBM server, former
AS/400) by using MPUT.

So what I am doing in detail:
I have got a Java client on my Windows 7 machine. There apache commons net is in use. By using
the class FTPClient I connect to an IBM machine (there is installed V7R1).

These are the commands I fire:
ftp.login(username, password);

When performing the storeFileStream NULL is returned instead of the output stream. Connection
can be established and everything is working well.

The problem is that a wrong reply-code is checked during openDataConnection.

Let me sum up the relevant steps:
1. storeFileStream is called
2. _storeFileStream(String, String) of FTPClient gets entered
3. Then _openDataConnection_ is entered
4. Inside this method the active connection mode part is executed
5. Using IP4 the port method is called there
6. Due to calling the PORT command for FTP a new return message is generated: “200 PORT
subcommand request successful.”
7. isPositiveCompletion returns true everything is fine up to here
8. Going on with the active connection mode part this leads to the sendCommand method where
– after executing the FTP command – the __getReply(boolean) method inside of __getReply()
is called.
9. And now the issue: _controlInput_.readLine() returns the PORT message mentioned before
instead of “150 Sending file to [myFile]”. When calling readLine again, the correct message
is returned.

Why is the message important?
Getting back to _openDataConnection_ after execution of sendCommand the method FTPReply.isPositivePreliminary
checks the reply-code, which is 200 instead of 150. This will cause a fail and a returning
of NULL as output stream.

That’s my guess:
There is missing a call of _controlInput_.readLine() to clear some information messages before
calling a new FTP command.

Thank you.

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